微电网背景下电能质量分析与治理

Analysis and Treatment of Power Quality in the Background of Microgrid

随着微电网中新能源发电的高渗透率及高比例电力电子设备的应用,加之不平衡、非线性等种类繁多的负荷及储能设备的接入,微电网中电能质量问题日益严峻且具有一定的特殊性:一方面,电压波动等传统问题在微电网中更为突出;另一方面,高度电力电子化以及开关频率的提高导致间谐波和超高次谐波等新问题。首先,介绍了微电网中电能质量问题的起因、特殊性、危害及综合治理措施;其次,针对国内外研究现状,总结了新能源并网中公共耦合点电压与频率偏差的治理方案、储能设备在微电网电能质量问题治理的工程应用,同时对电力弹簧、多功能并网逆变器等新技术进行了介绍;最后,结合我国智能电网发展,对微电网电能质量问题的综合治理进行展望。

With the high penetration rate of new energy power generation in microgrids and the application of high proportion of power electronic equipment,coupled with the access of a wide variety of loads such as unbalanced and non-linear loads and energy storage device,the power quality problems in microgrids have become increasingly serious and has certain particularities:on the one hand,traditional problems such as voltage fluctuations are more prominent in the microgrid;on the other hand,the high degree of power electronics and the increase in switching frequency lead to some new problems such as inter-harmonics and ultra-high harmonics.Firstly,the causes,characteristics and hazards of traditional power quality problems in microgrids and comprehensive curing measures were introduced.Secondly,according to the current research status at home and abroad,the treatment of voltage and frequency deviations at point of common coupling in new energy grids were summarized.Moreover,new technologies such as power springs and multi-function grid-connected inverters were introduced.Finally,combined with the development of Chinese smart grid,the comprehensive management of microgrid power quality problems was prospected.